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5. Too vainIf an attacker sends a large number of SYN requests with fake source addresses, the server side will consume a lot of resources to handle this semi-connection, and saving traversal will consume a lot of CPU time and memory, not to mention retrying SYN + ACK on IP in this list. TCP is a reliable protocol, and messages will be retransmitted at this time. The default number of retries is 5. The interval time of retries is doubled from 1s to 1s + 2s + 4s + 8s + 16s = 31s respectively. After the fifth time is sent out, it will take 32s to know that the fifth time has timed out, so the total is 31 + 32=63s.20年前著名心理学家欧阳秋和好友兼同事的阮昊天（刘骐饰），前往黎明城一起参与一项秘密的研究项目，但是在研究过程中不知发生了何种变故，最终欧阳秋离奇坠楼而死，好友阮昊天（刘骐饰）也如人间蒸发一般神秘失踪，研究项目随即被叫停。If the ammunition consumption and duration are taken as the criteria, The fighting at position 149 was not as intense as at the previous two positions, But the casualties were the greatest, Investigate its reason, It is precisely because the "living biological weapons" put into the battlefield by the Vietnamese army this time have "flying units", Not only that, It is also accompanied by another type of "living biological weapon" that can operate underground. A special "air-ground coordination" three-dimensional strike has been formed under one day and one place. This made our soldiers in position 142 overwhelmed at that time. During the interview, I had a lot of trouble to find a veteran of that year. His name was Zhang Xiaobo. When recalling the battle, I could see that he was still concerned about the battle, both in tone and manner.　　此次四人要到马来西亚侦察一名科学家，希望偷取其刚研制成功的治癌药。可是在悄悄潜入药厂行动的过程中四人却遭遇埋伏，方知此次任务是骗局一场。在四人试图逃脱的过程中，Mac失手，但因神秘性感的女子June（舒淇）得以解困。从June身上，Mac忆起前女友被旧拍档出卖而死去的往事，并拥有了一个破解迷局的重要线索。《芝加哥打字机》为韩国tvN自2017年4月7日起播出的tvN金土连续剧，由人气剧集《拥抱太阳的月亮》，《Kill Me Heal Me》的作家陈秀完与电视剧《通往机场的路》导演金哲圭共同打造，讲述了1930年代日本统治下的文人们转世还生后与古老可疑的打字机交织而成三位男女的奇幻复古浪漫喜剧故事。江枫自杀殉情，邀月接受怜星的建议，决定抚养一个孩子，等到十几年后，让这对孪生兄弟生死对决。